期刊
ACS APPLIED MATERIALS & INTERFACES
卷 9, 期 4, 页码 3865-3872出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b15939
关键词
CH-pi interaction; visible fluorescence and near-infrared phosphorescence; unimolecular complex emission; tunable intersystem crossing; mechanical stimuli
资金
- NSFC/China [21644005]
- National Program for Thousand Young Talents of China
- Swedish National Infrastructure for Computing (SNIC) [SNIC 2014-11/31]
- Shanghai Pujiang Program [15PJ1402600]
CH-pi interaction-assisted alignment of organic conjugated systems has played an important role to regulate molecular electronic and photophysical properties, whereas harnessing such a smart noncovalent interaction into the tuning of unimolecular complex emissive bands covering a wide spectral region remains a challenging research topic. Since the tuning for visible and near-infrared emissive properties in a single pi-functional platform relates to its multicolor luminescent behaviors and potential superior application in analysis, bioimaging, and sensing, herein, we report a proportional control of the singlet and triplet emissions that cover visible and near-infrared spectral regions, respectively, can be straightforwardly achieved by CH-pi interaction-assisted self-assembly at the unimolecular level. Employing an octathionaphthalene-based single luminophore as a prototype, we find that a strength-adjustable CH-pi interaction-assisted self-assembly can be established in mixed DMF/H2O and in the film state. The hybridization of planar local excited and intramolecular charge transfer transitions occurs on the basis, allowing a competitive inhibition to the intersystem crossing process to generate a complex emission composed of visible fluorescence and near-infrared phosphorescence. Furthermore, reversible mechanochromic and mechanoluminescent conversions of the corresponding solid sample can both be observed to rely on a corresponding self-assembly alternation. These results can probably provide new visions for the development of future intelligent and multifunctional luminescent materials.
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